The following are some statements about the characteristics of covalent compounds i) The combination of a metal and non-metal must give a covalent compound. ii) All covalent substances are bad condu-ctors of electricity. iii) All covalent substances are gases at room temperature. The correct combination is

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all are correct

only i and ii are correct

only ii and iii are correct

all are wrong

answer is D.

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Detailed Solution

(i) Metal + Nonmetal →Covalent bond false They form ionic bond(ii) covalent substances - bad conductor false Graphite is a good conductor of electricity(iii) All covalent substances - Gases at room temperature falseMany covalent substances are solids or liquids. Diamond, Graphite, ethylalcohol, Benzene etc are not gases.

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